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Old 03-05-2012, 06:50 AM   #11
brulaz
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Quote:
Originally Posted by Mr. Adventure View Post
... my WDH is moving 100# to the front axle and 86# to the trailer axle, leaving 320 # on the rear axle. But yes, this has the effect of avoiding the 733# I'd otherwise have on the rear axle. yielding a net rear axle improvement of 413#, all with only 86# additional on the trailer axle. ...
Well a 100# increase on the front and 86# increase on the trailer axle doesn't add up to 413# loss on the rear. As your total rig weight shouldn't have changed when going from a non-WDH to a WDH configuration, something seems wrong.

Just to clarify, here are my recent numbers from two passes on a CAT scale
(I also did a third pass with the TV only but that's not relevant here):

Truck+Trailer with No WD (spring bars removed)
Steer 3000
Drive 3960
Trailer 3460
Total 10420

Truck+Trailer with 3 link free WD (6 links under tension)
Steer 3280
Drive 3520
Trailer 3620
Total 10420

The Totals are the same.
The WDH decreases the drive axle weight by 3960-3520=440#
The WDH increases the steer axle weight by 3280-3000=280#
The WDH increases the trailer axle weight by 3620-3460=160#
And the changes add up: 160+280=440#, as the Totals are the same.

Yours #'s apparently do not add up, so you're doing something different?
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Old 03-05-2012, 07:11 AM   #12
Mr. Adventure
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Quote:
Originally Posted by brulaz View Post
...As your total rig weight shouldn't have changed when going from a non-WDH to a WDH configuration, something seems wrong...
I put your numbers into the spreadsheet, and the resulting spreadsheet is attached. Per your question (thanks!), I've added some calcs that show what's happening to the tongue weight, making it easier to see what's going on (the math confusion is about mixing numbers for tongue weight distributions and axle improvements, sort of like getting your debits and credits crossed).

The bottom line is that you have a 580# tongue weight. Without a WDH, the tongue weight adds 840# to the rear axle and subtracts 260# from the front axle (840-260=580). With the WDH, 20# go to the front, 400 stay on the rear, and 160 go to the trailer axle (20+400+160=580).

I'm surprised by how much weight is being added back to the trailer with your WDH, and I look forward to looking at this with the WDH calculator when you have the measurements. With your good sized pickup truck and light trailer axle rating, I think I might scale the WDH back a notch.


I also updated the original WDH spreadsheet thread with the Brulaz improvements:
http://www.trailmanorowners.com/foru...0143#post90143
Attached Files
File Type: xls Mr_Adventures_WDH_Calculator 3-9-12.xls (37.5 KB, 11 views)
File Type: xls Mr_Adventures_Scale_Calculator.xls (21.5 KB, 10 views)
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2005 TrailManor 3023
2003 Toyota Highlander 220hp V6 FWD
Reese 1000# round bar Weight Distributing Hitch
Prodigy brake controller.

"It's not how fast you can go, it's how fast you can stop an RV that counts."
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